Retractable formation sealing tool



May 18, 1943 w. w. DRINKARD RETRACTIBLE FORMATION SEALING' TOOL Filed May 20, 1940 2 Sheets-Sheet l May 18, 1943 w. w. DRINKARD RETRACTIBLE FORMATION SEALING TOOL Filed May 20, 1940 2 Sheets-Sheet 2 l W Wr mida/ni I atented May '18, 1943 RETRACTABLE Woodrow Wilsonv Drlnkard, Longview, Tex. Application May 20, 1940, Serial No. 336,254

` (ci. 16s-12) 18 Claims.

This invention relates 'to well cementing apparatusand more particularly to a device for insertion in a well casing to permit the discharge of liquid cement into the formation surrounding the well bore, for repressuring the formation or discharging any selected fluid into the formation.

An object of this invention is to provide a device of this kind which may be lockedfrom the surface of the ground at any desired point in Y the well casing and which may be reset as many times as desired at different points in the casing. Another objectof this invention is to provide a structure of this kind which will provide for the initial discharge of fluid cement or other material in the bore or formation and also permit the removal of excess cement so as toeliminate the necessity ofv drilling through and destroying a retainer for the cement. i

A still further object of this invention is to provide a structure of this kind wherein the uid material is discharged from the lower end of the tool, thus eliminating any projecting parts below the tool and permitting the use of the tool at the extreme bottom ofthe well bore.

A further object of this invention is to provide a structure of this kind wherein .the reversing of the circulation of material can be effected without change in` position or adjustment of the tubing. i

A further object o-f this invention is to provide a tool of this kind wherein the release thereof is effected by Withdrawal of the tool vertically out of the casing. i

A further object of this invention is to provide a tool of this kind wherein thetool can be safely removed from the casing after the cementing` operation without damage to the tool or casing or detachment of any part thereof, or without aiecting the condition of the material inserted into the well easing. i i

A further object of this invention is to provide a tool of this kind which may be inserted in a dry hole, a gas well hole, or a hole containing liquid,

and `which isindependentin its positioningor release of the presence or absence of hydraulic means.

`assist; in the release of the tool, the fluid pressure being applied in the same direction as the iiow of material into the casing. o

A further object of this invention is to pro- 4vide a tool of this kind wherein the locking or clamping slips may be moved to a locking or clamping position by partial rotation of one part of the tool relative to another part accompanied by subsequent endwise movement of the rotated part. i

A further object of this invention is to provide a .tool of this kind formed with a downwardly closing valve and initially opened fluid ports above the valve so that the tool may readily be lowered into a body of liquid in the' casing and the' fluid ports subsequently closed simultaneously with the setting or locking of the tool at the desired point. f

A further object of this invention is to provide a yieldable sealing means adjacent to and slightly above the point of discharge which is held in operative or sealing position by .the pressure of the discharging material so as to thereby prevent the fluid material from rising above the desired point. A further object of this invention is to provide in a tool of this kind, a sealing means which is not only moved to operative or sealing position by pressure `of the discharging material, but which will also exert an upward force on the locking slips independent of the downward pressure exerted on the slips by the weight of the tubing so as to apply a locking pressure on the slips in a Yreverse direction to the discharging material and in proportion to the pressure of the discharging material. In this matter the greater l the` prsure of the discharging materiall the greater the locking or clamping force will be on the slips. i Y

A further object of this invention is to provide a tool of this kind whereby the pressure exerted beneath the packing rubbers, will tend to lift the tubing string and thereby exert additional force on the slips from 4below so that the slips will rmly grip the well casing and hold the tool in its set position.

A further object of this invention is to provide a tool of this kind with the packing rubbers so arranged and the internal packing gland which is mounted in the body, S0 attached to the body that only the cross-sectional area of .the mandrel at `the open lower end thereof is'exposed tothe direct upward pressure exerted b elow the tool. i

To the foregoing objects and to others which mayhereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawings wherein are shown embodiments ofthe invention, but it is to be understood .that changes,

-in a well bore in the conventional manner.

variations and modifications may be resorted to which fall within-the scope claimed. I

In the drawings: Figures l and 1 a are a vertical section of a retractable format-ion cementer constructed ac- Y Figure 3 is a fragmentary sectional view taken on the line 3 3 of Figure 1.

Figured is a sectional view taken on the line 3 5 of Figure 1. f

Figure 5 is a sectional view taken on the line L5 5 of Figure 2b.-

Figure 6 is a fragmentary side-elevation of a portion of the tool.

Referring to the drawings, the numeral I 3 designates generally a casing which is inserted In order to provide va lmeans whereby cement or other initially plastic or fluid composition may be injected into the casing I or into the formation about the casing I0, I have provided a tubular body or member i I which is substantially smaller ,in diameter than the diameter of the casing I0.

A tubular mandrel I2 winch is substantially smaller in diameter than the tubular body II', is disposed concentrically to the body II -and the upper end of-the mandrel I2 is provided with i threads I3 Iengaging in a combined coupling and slip expander operating member 'iii which is adapted to be connected to a string oi pipe which is extended down throughV the casing' i@ -and through which the fluid cement or other uid composition is adapted to pass. The tubular body comprises an upper section Il, an intermediate section I6 and a lower section 29. The mandrel i2 is vertically slidable through a packing generally designated as I5 which is disposed below the tubular body I I. The packing I5 is positioned in the intermediate sections I6 which is of substantially the same diameter as the upper body section ||a and the intermediate body I5 is threaded at its upper end I 'I onto the lower end of the body section II. The sleeve or intermediate body i6 is provided with interior threads I8 and I9 extending inwardly from the upper and lower ends respectively of the sleeve I6 and upper and lower lock nuts or rings 20 and 2| engage the threads I8 and I9, respectively, and engage on opposite ends of the packing I5 so as to hold the packing I5 against endwise movement in the sleeve I6.

The packing I5 comprises an upper yieldable annular body 22 which is formed with a frustoconical extension 23 engaging about the mandrel I2. The packing I5 also comprises-a. lower annular body 24 formed with' a frusto-conical extension or gland member 25engaging about the mandrel I2.. An` intermediate ring 2|`enga`gesbetween-the yieldable bodies- 22 and 23.3 The` clamping rings ory nuts and2'l are each proof the invention as CII 5A lower tubular sleeve 29 extends downwardlyv "from the sleeve i3 and is threaded at its upper end into the sleeve i6 as at 33. The sleeve 29 is of subst ntially the same diameter as the-tubular body A lower sleeve 3| is threaded as at 32 into the lower end oi the sleeve 29 and is substantially smaller in diameter than the sleeve 29. The sleeve or extension 3| is provided with a collar or iiange 33 at its lower end and this collar or sleeve 33 is formed with a cylindrical guide surface 34 terminating at its lower end in a roundedk seat 35. A valve seat 36 is this sealing member 39 is normally, inclined downwardly and at its upper end is adapted to engage an inwardly tapered seat d0 carried by the lower end of the sleeve 29. The sealing member 39 is of yieldable composition being formed of rubber or other iiexible or pliable material so that the sealing member 39 may be distorted outwardly to the position shown in Figure 2b. A sliding ring il is loosely mounted on the sleeve or cage 3| below the sealing member 39 and the upper edge of the ring 4| is adapted to engage the lowered inclined face i2 of the sealing member 39 so that when the ring 4| is moved upwardly, the sealing member39 will be forced outvided with tapered inner portions 2`|.and 28, re-

spectively. which engage the tapered surfaces of the frusto-conical members 23- and 25 so that tightening. ofthe nuts 2|! and 2| will not only wardly against the inner surface of the casing I0.

A second yieldable sealing member d3 is loosely mounted on the cage or sleeve 3| and is of a coniiguration similar to that of the sealing member 39 being formed of a substantially frusto-conical conguration in side elevation. An annular combined valve member and seal operating member M is disposed below the lower sealing member 42 and is slidable on the sleeve 3|. The upper edge of the ring shaped valve member and seal operating member 44 is tapered as at 45 to provide a seal expanding portion and is adapted to engage the inner face of the lower sealing member 4| as shown in Figures 1a and 2b and move the sealing member to expanded position. The operating member 44 at itsl lower portion is formed with an enlarged bore 46 which forms with the exterior of the sleeve 3| a pressure chamber 41. The lower edge of the reduced portion 48 formed by the enlarged bore 46 is rounded oil as at 49 and is adapted when the combined valve member and seal operator 44 is in a lowered or closed position to engage on the rounded seat of the head 33.

The sleeve or cage member 3| at a point above the seat 36 is formed with a plurality of ports 50 which communicate with the pressure chamber 41. When the fluid is discharged downwardly from the lower end of the mandrel |2 into the cage or sleeve 3|, this iiuid will iiow out through the ports 5|! into the pressure chamber Hand then the pressure of this iuid will raise may flow out of the ports 50 'into the casing I0 and into the formation about the casing illv at a point below the lower end of the valve member 4.4 and" below `the lcwermost sealing member 43. i

body II may be frictionally held against rotation relative tov the casing i0, I have provided a plurality of elongated flat springs I which are anchored or xed at their upper ends 52 in re- 'cesses 53 formed in the body II adjacent the upper end thereof.` The springs "5I are secured in the recesses 53 by means of fastening devices 54. The springs 5I are longitudinally bowed so that the convex faces thereof will contact with the inner surface of the casing AIII and thus holdv the tool or tubular body II concentric to "the casing I0. The lower ends of the springs 5| are free and slidably engaged in guidevrecesses 55 which are formed in the sleeve or coupling `member I6.

'e 'The tubular bodyil is adapted to be incirca or clamped in the selected position within the casing lli by means of a plurality of slips or clamping members generally designated as 56.

In practice there are at least three of these slips' f 56 which have arcuate outer faces formed with vertical, the inner concave faces 58 will form an4 inverted socket.

' Each slip 56 is formed with a downwardlyextending arm 66 which is pivotally connected to the upper end of a link 6I ,as by a pivot 62. The

upper end of the link 6I may be formed with ay pair of arms between which the lower end of the arm 60 is adapted to engage. 'I'he lower end of each link 6I is formed with an arm` 63 engaging in a notch 64 provided in the upper end of the tubular body II. The arm 63 is pivotally held in the notch 64 by `means of a pin or pivot member 65.

A slip expander generally designated as 66 is slidable on the mandrel I2 and the slip expander 66. is formed with an inverted frusto-conical surface 61 which is adapted to slidably engage the arcuate surfaces 58 of the slips 56. The ex' pander 66 on the tapered or frusto-conical surface 61 thereof is formed with a plurality of key ways or grooves 68 in which the keys o ribs 69 slidably engage. The expander 66 is formed at its upper portion with a reduced and upwardly f tapered head 69 which isvadapted to be engaged by and contact with the coupling member I4 as shown in Figure 2. 1

In order to provide a means whereby the wedge or expander 66 may beAmoved upwardly to a released position upon upward movement of the. mandrel I2 relative to the body II, I have provided an annular flange or lower Wedge operator 10 which is carried by thelmandrel I2 at a point downwardly from the upper end thereof. The flange or operator 1I! has a horizontal o'r flat upper face which is adapted to engage Athe truncated lower end of the wedge member 66 so as to` pull this member 66 upwardly and thus release the slips 56 from the inner surface of the `casing I0. In Figure l the slip operator 66 is ameter of the tubularbody Il.

operator will be in contacting relation withrespect to the collar 10 and the upper end of the collar 10 will be in contact with the lower ends of the keys 59. e

The mandrel I2 at a point downwardly from the operator or collar 10 is formed with a second collar or flange 1I and the collar 1I is preferably of a diameter substantially equal to the inner di- The body II adjacent the upper end thereof is formed with a reduced diameter 12 forming a shoulder` 13 againstwhich the upper end of the collar 10 is adapted to engage. The body I I is formed with a pair of diametrically opposed elongated slots 14 which at their upper ends communicate `with a horizontally disposed or lateral slot 15 forming an inverted J-slot. The collar or flange `1I has secured thereto a pair of outwardly extending studs or pins 16 which slidably engage in the' J-slot formed by the twg slots 1.4` and 15 and when the `pins 16 are in the horizontal portion 15,'the mandrel I2`is locked against endwise movement relative to the body II. When it isdesired `to move 'the mandrel I2 downwardly relative to the body drel I2 is in a lowermost position, the outlet port 11 is positioned below the packing member I5. When the mandrel I2 is in an uppermost or released position, the port 11 will communicate with the body II above the packing I5 so that lfluid may now upwardly past the valve 38 to unseat the valve and then enter the lower open end A of the mandrel I2 and be discharged laterally through'the port 11 into the bodywl I. The fluid may then flow laterally and outwardly of the body .ll'tlliough the J-slots 14-15 and into the casing In the use and operationcf this tool, the coupling member I4 is threaded onto the lower end of a string of pipe through which the fluid is adapted lto be forced downwardly into the well or e which may be used as a means for withdrawing fluid from the casing I0 at a point below the tool hereinbefore described. Initially the mandrel I2 is locked by disposing the locking pins or studs 16 in the horizontal portions 15 of the inverted J-slots and at this time the slip expander 66 will be in a position shown in Figure l and the mandrel I2 will be in the position shown in Figi ures 1 and la. The entire structure may then be lowered into the well with the springs 5I fric tionally engaging the inner surface of the casing I0. When the tool has been lowered to the desired point,y the tool may be given a partial rotation so as to remove the locking studs' or pins 16 from the horizontal slots 15 whereupon the mandrel I2 with the string thereto may be lowered.

The springs 5I will yieldingly hold the body II against rotation relative to the casing I0 so that the mandrel I2 may be rotated to a released position-andrsubsequently lowered without movement ofthe body II.' When the coupling member or ram I4 engages the head 69 of the slip expander 66,` the expander 66 will be forced downwardly and the slips56 will also be forced laterally and outof pipe attached l'wardlyagainst theinner surface of the casing I 0.

The serrations or teeth 51 on the slips 56 will bite into ,the casingl and thus hold the slips 56 tightly against the casing I0. f

The pressure on the slips 56 may be exerted on the slips fromopposite directions. Initially the weight of the tubing connected to the coupling I4 will effect spreading of the slips so that lthe teeth s1 win bite into the easingv lo. In this the slips 56 upwardly against the downward and lateral force exerted on the slips 56 by the weight ofy the tubing. As thepressure on-opposite sides of' the valve 38 is equalized this valve will stay in closed position.

In this manner if the weight of the such that the downward pressure exerted on the slips is not sufficient to lock the slips against movement, the pressure exerted from below the tool will exert sufllcient upward pressure on the tubing is slips 56 to cause the slips to be firmly locked to the casing I0. It will, therefore, be apparent that downward pressure exerted on the wedge 66, as in the event the tubing weight will not lock the slips,

-the upward force of the fluid pressure will exert suillcientl increased pressure on the slips 56 to cause the slips to move upward andoutward until the teeth 51 finally lock the slips 56 against the casing I0.

When the mandrel I2 is lowered to the position shown in Figures 2 and 2`-the fluid material may then be forced d ownzwardlyfor discharge out of the mandrel I2 and also out of theport 11 which at this time is positioned below the packing member or guide I5. The pressure of the discharged fluid from the mandrel I2 will be communicated through the ports 50 to the pressure chamber 41 and the pressure of the fluid in the chamber 41 will raise the combined valve and sleeve 44 upwardly so as to expand the two sealing members 39' and 43 against the inner surface of the casing I0. When the combined seal operator and valve member 44 is moved upwardly by the pressure of the fluid to the position shown in Figure 2b, the fluid material may be discharged into the casing IIJ below. the lowermost of the sealing members 43. The outlet ports 50 are positioned closely adjacent the lower end of the valve cage or sleeve 3I so that there will not be any substantial length of the tool projecting below the point of discharge of the material into the casing I0. It will also be understood that the pressure of the fluid material in the casing I 0 about the valve member 44 will havea tendency to expand the lowermost sealing member 43 and maintain this member 43 exists.`

'I'he invertedgJ-slots 14-15 .being open the material will enter the body I I above the gland I5, but as the port 11 is at this time below the gland I5, the material cannot enter the'mandrel I2 above the gland I5. 'I'he fluid material, such as water. gas orthe like will move downwardlyl outside of the body Il and force the sealing members ,39 and 43 to contract and move downwardlyto inoperative position.. The valve. 44 will likewise .move downwardly to close the ports 50 but the pressure of the fluidwill unseat the'valve 38 and permit the fluid Ito flow upwardly into the cage 3l The lower end of the mandrel I2 being open and within-the cage 3I and the port 11 being below the gland I5 the iluid will flow upwardly in the mandrel 2.

Second: The mandrel I2 may be raised to the position shown in Figure 1a wherein the port 11 is above thepacking gland I5. In this position of the mandrel I2, the downward flowing fluid in the casing II! and exterior of the body II will enter the inverted J-slots 14e-15 and then enter the mandrel I2 through the port 11. The force of the fluid entering the mandrel I2 through the port 11 will cause seme of this fluid to enter the chamber below the gland I5 through the open lower end of the mandrel I2 and maintain the valve 38 in a'closed position.

If it is desired to withdraw the entire tool this may be done by pulling the mandrel I2 upwardly so that the collar 1I engages the shoulder 'I3 at the upper end of the body II. At this time the releasing collar 10 will tbe in an 4uppermost position and engage the lower end of shoulders on .the slips so as to move the slips 56 and wedge 66 upwardly to a released position, which is the po' sition shown `in Figure l. The slips-56 will then be released from the inner surface of the casing I0 and the entire tool may frictionally be pulled upwardly from the casing' IIL In withdrawing the tool from the casing I0, it is not necessary to In the event it is desired to reverse the flow of v the material so as to force out the excess material, this may be done in one of two ways. First; The mandrel I 2 may be left in its discharging position, which is the position shown in Figure 2b, The fluid material is'then pumpedl down inside the casing I0 fromthe surface outside the manfirst move the mandrel I2 upwardly until the colar 1I engages the pins or studs 16 in the horizontal slots 15. This rotary movement may be given to the mandrel I2 so as to lock the lbody II relative to the mandrel I2 but such rotary movement is not necessary. Preferably the collar 1I is so positioned on the mandrel I2 that when the collar 1I engages'the shoulder 13, the pins 16 are] in a positin confronting the adjacent ends of the horizontal slots 15.

With a tool of this character, the cement or other material may be discharged to the well irrespeotiveof whether the well is dry or whether there is fluid or gas in the well. In the event there is fluid or liquid inthe well when the tool is lowered to a point `below the upper level ofthe liquid, the valve 38 will be moved to an open po'- sition and permit the liquid to flow into the interior of the tool and from the interior of the tool the liquid will flow through the mandrel I2 out of the port 11 into the body I I and out of the body II through the inverted J-slots 14.

In the event during the raising of the tool from the casing III the sealing members 39 and 43 should stick to the inner surface of the casing I6, the sealing members 39 and 43 may lbe forcibly released 'by applying fluid pressure in the casing I0. This fluid pressure will push the sealing members 39 and 43 downwardly to a released positionf Underl normal conditions, however, the sealing member 39 and 43 will be moved to a released position by merely pulling the tool upwardly and if the sealing members 39 and 43 stick they will slide downwardly on the sleeve 43 which at this time is moving upwardly and in this manner the pressure ofthe ring 43 on the sealing mennber 38 and the valve member Il on the seal-` ing member 43 will be released so that the sealing members 39 and 4I may readily contract to the full line position shown in Figure 1l. What I claim is: 1., A' formation sealing tool comprising a tuburar body, a downwardly closing valve atthe lowe;` end of said body, distortable sealingjmeans carried by said lbody. a combined cylindrical valve and sealing means\operator slidably carried by said body, an annular valvefseat carried by said body said -body being formed with outlet ports' above said first valve and confronting said seco ond valve when said second valve is in closed position and engaged with said annular valve seat, i

said second valve including an annular pressure operated valve. operating means wherebyiiuid pressure passing through said ports will move said second valve to an open position and simultaneously distort said sealing 'means to adseallng position with the casing.

2. A formation sealing tool for a well casing carried by said body engageable with said cylindrical valve and movable upwardly by said cylindrical valve to a distorted sealing position, and meansdlscharging a fluid under pressure into `said body and through the ports thereininto said annular chamber tofopen `said cylindrical valve.

3. A formation sealing tool comprising a tubular body insertable in a well casing, an outwardly closing valve at one endfoilsaid body, `a fluid material conducting mandrel concentric to said body, packing means in said body slidably and rotatably mounting lsaid mandrel said body, said mandrel having an openend 1in said body and a port spaced from said open end, a collar iixed to said mandrel above said port, outwardlyextend; ing pins carried by said collar, an'inwardly extended shoulder carried by said body for limiting the endwise movement of said collar and mandrel in onedirection, said body having inverted J- slots'in which said pins loosely engage, pivoted body clamping members carried by the opposite end of said body, an inverted substantially coni--` cal expanding member slidable on said mandrel and engageable with said clamping members for moving said clamping members outwardly into clamping engagement with the well` casing, an upper operator carried by said mandrel engageable with said expanding member upon endwise movement 'of said mandrel in a downward direction for moving said expanding member to operative position. and a second operator iixed to `said mandrel below said expanding member and engageable with said expanding member for moving said expanding Vmember to released or mop--V of said erative position upon endwise movement mandrel in an, upward direction.

4. A formation sealing tool for a well casing comprising a tubular body, an outwardly closing valve at one end of said body, a iluld conducting d mandrel slidable and rotatable in said body, one end of said mandrel terminating in said body, radial locking pins carried by said mandrel, said body having inverted J-slots in which said pins loosely engage, clamping means carried partly by said body and partly by said mandrel for clamp-v ing said body to the casing upon endwise movement of `said mandrel in one direction, means 5 carried by said mandrel for -releasing said clamping means from the casing uponendwise movement of the mandrel in the oppositel direction, and pressure operated combined sealing means and valve structure carried by said body adjacent said first valve for sealing the space between the said one end of said `body and the casing, the force exerted by said combined sealing means andvalve structure in moving to sealing position acting in a reverse direction to the force exerted by the clamping part carried by said mandrel to thereby increase the clamping engagement of said clamping means with the casing.

-5. A formation sealing toolfor a well casing ing valve carried by the lower end of said body, a plurality of clamping slipspivotally carried by the upper end of said body, springs carried by said body for holding the body concentric to the casing and for frictionally holding the body Aagainst sliding movement relative to the casing, a uid conducting mandrel slidable relative to said body, a wedge slidable` on said mandrel, anabutment fixed to said mandrel engageable with said wedge for-moving said wedge downwardly to thereby move said slips outwardly to clamping position, and a second abutment carried by said mandrel below said Wedge active upon upward movement of said mandrel to move said Wedge to released position.

6. A formation sealing tool for a well casing comprising a tubular body, a Vdownwardly closing valve carried by the lower end of said body, a plurality of clamping slips pivotally carried by the upper end of said body, springs carried by said body for holding the body concentric to the casing and for frictionally holding the body against sliding movement relative to the casing; a uid conducting mandrel slidable relative to said body, a wedge slidable on said mandrel, an abutment xed `to said mandrel engageable with said wedge fo'r moving said wedge downwardly to thereby move said slips outwardly to clamping position, a second abutment carried by said mandrel below said wedge active upon upward move-f ment of said mandrel to move said wedge to released position, and coacting locking means carried by said mandrel and said body for releasably locking said mandrel to said body.

7. A formation sealing tool for a well casing comprisinga tubular body, adownwardly closing valve carried by the lower end of saidf'body, a plurality of clamping slips pivotally carried by the upper end of said body, springs carried by said body for holding the body concentric to the casing and for frictionally holding the body against sliding movement relative to the casing, a iluid conducting mandrel slidable relative to said-body, a Wedge slidable on said mandrel, an abutment fixed to said mandrel engageable with said wedge for moving said wedge downwardly to thereby move said slips outwardly to clamping position, a second abutment carried by saidmandrel below said wedge active upon upward movement of said mandrel to move saidwedge to released position, said body having a pair of inverted .I slots constituting combined fluid ponts and keepers, and locking pins carried by said mandrel engageable in said slots for releasably locking said mandrel to said body. 8. A formation sealing tool for a well casing comprising a tubular body, a downwardly closvcomprising a tubular bo y, a iluid conducting -annularcombined :duid pressure operated valve mandrel movably carried y said body, a downwardly closing valve at the lower end of said body, means operable by movement of said mandrel forreleasably clamping said body to the casing,

and operator for said sealing members slidably carried by said body, said body having vports above said rst valve confronting said second valvev when said second valve ,isin closed position.

9. A formation sealing tool for a well casing comprising a tubular body, a fluid conducting mandrel movably carried by saidbody, a downwardly closing valve at the lower end of said body, means operable,r by movement of said mandrel for releasably clamping said body to the casing, a pair of distortable sealing members' slidably4 carried by said body, a ring between said members and slidably'carried by said body, and 4an annular combined guid pressure operated valve and operator for said sealing members slidably carried by said body, said body having ports above said rst valve confronting said second valve when said second valve is in closed position, said annular valve having an annular chamber confronting said ports and opening said ports slidably carried by said body, expansible sealing means slidably caried by said body and engageable with said pressure operated valve medium; the combination of a sleeve secured i within and extending from the lower end o! said body, said sleeve being formed at its lower end with a peripheral extension, a valve seat at the lower end of said sleeve, .a fluid rpressure operated valve engageable on saidseat, said sleeve opening and closing said ports and for sealing the` space between said sleeve and casing, said structure being slidably mounted upon said sleeve between said extension and the lower end of said body. A

.13. In a formation sealing tool for an oil well casing and with such tool having a body for insertion into the casing and a mandrel for attachment to a tubing for conducting a sealing medium; the combination of a* sleeve secured within and extending from the lower end oi said body, said sleeve being formed at its lower end with a peripheral extension, a valve seat carvried by said sleeve, a iluid pressure operated 4valve engageable on said seat,\said lsleeve'having ports means for expansion and movement thereby,

casing clamping members pivotally carried by said body adjacent the upper end thereof, means connected vto the tubing for moving said clamping members to clamping position upon movement of said tubing downwardly relative to the body, means movable with said tubing and operable upon movement of said tubing upwardly relative to said body for moving said clamping members to released position.

11. A formation sealing tool comprising a tubular body, a downwardly closing valve at the lowerend of said body, distortable sealing means disposed about said body, a combined cylindrical I valve and annular sealing means operator slidably carried by said body, annular valve seat carried by said body, said body being formed with outlet ports above said iirst valve and confronta pressure chamber about said body communicating with said ports, uid pressure in said chamber acting on said operator to thereby move multaneously distort said sealing means to a sealing position relative to the casing.

12. In a formation sealing tool for an oil well lcasing andwith such tool having a body for insertion into the casing and a mandrel for attachment to a tubing for conducting a sealing said valve upwardly to an open position and sisure operated combined controlling and sealing structure for opening and closing said ports and for sealing the space between said sleeve and casing, said structure being slidably mounted upon said-sleeve between said extension and the lower end of said body, said structure including alternately disposed superimposed rigid and distortible annular members, said rigid members being of le'ss outer diameter than said distortible members.`

14. In a formation sealing tool for an oil well casing and with such tool having a tubular body for insertion into the casing and a mandrel for attachment to a tubing for conducting a sealing medium; the combination of a sleeve secured within and extending from the lower end of said body, said sleeve being formed at its lower end with a peripheral extension, a valve seat carried by said sleeve, a fluid pressure operated valve engageable on said seat, said sleeve having ports in its body adjacent said seat, and a fluid pressure operated sealing structure for opening and closing said ports and for sealing the space between said sleeve and casing, said structure being slidably mounted upon said sleeve between said extension and the lower end of said body, said structure including alternately disposed superimposed rigid and distortiblev annular members, said rigid members being `of less outer diameter than said distortible members, said members and the lower end of said tubular body having inclined surfaces correlating with the distortible members for shifting the latter to sealing position when said structure is operated by fluid pressure from within said sleeve.

15. In a formationr sealing tool for an oil well casing a tubular body formed of an upper section provided with diametrically opposed lengthwise slots, an intermediate section connected to said upper section and provided intermediate its ends with an axially apertured partition and a lower end section connected to said intermediate section, a sleeve having its upper terminal portion secured to the lower end of said lower section .and provided at its lower end with a valve seat, a fluid pressure operated valve within the sleeve correlating with said seat, said sleeve being formed with lateral ports above said seat and a. peripheral extension at its lower end, a vertically movable `iiuid pressure operated chambered cylindrical valve encompassing said sleeve for normally closing said ports, a distortible sealing means about saidsleeve, and interposed between the latter and the lower end of said lower section and distorted to sealing position on the upward movement of the cylindrical valve, an expansible clamping structure pivoted to the upper end of said ,upper section, and a fluid conducting mandrel extending through said clamping structure, body and partition for expanding the clamping structure to clamping position, said mandrel having oppositely disposed means travelling in said slots and a lengthwise slot in proximity to its lower end for positioning below said partition when the mandrel is in tool expanding position and for positioning above said partition when the mandrel is in tool retracting position.

16. A formation sealing tool for a well casing comprising a tubular body for insertion into the casing, a fluid conducting mandrel carried byv said body, a downwardly closing valve at the lower end of said body, a second endwise movable cylindrical valve carried by said body adjacent `said rst valve, said second valve being formed with a downwardly opening annular chamber about said body and said body having ports communicating with said chamber, iiuid pressure in said chamber effecting endwise movement of said second valve to an open position, and a distortable sealing member about said body and bearing against said second valve whereby movement of said second valve to an open position willdistort said sealing member outwardly to a position contacting with the inner surface of the well casing.

' 1'7. A formation sealing tool for a well casing comprising a tubular body for insertion into the casing, a fluid conducting mandrel carried by said body, a closure means at the lower end of said body, a downwardly ared distortable sealing member carried by said body adjacent the lower end thereof, said body having outlet ports below said member, and means normally engageable over said ports for closing the latter, said means being movable upwardly by fluid pressure passing through said ports to uncover said ports and simultaneously distort said member outwardly to contact the inner surface of said casing.

18. A formation sealing tool for a well casing comprising a tubular body for insertion into the casing, a uid conducting mandrel carried by said body, a downwardly closing valve at thelower end of said body, a downwardly flared distortable sealing member carried by said body adjacent the lower end thereof, said body having outlet ports below said member, and means normally engageable over said ports for closing the latter, said means being movable upwardly by fluid pressure passing through said ports to uncover said ports and simultaneously distort said member outwardly to contact the inner surface of said casing.

WOODROW W. DRINKARD. 

